headphone_super.dart

class NoiseCancellingHeadphone extends BluetoothHeadphone {
  bool noiseCancellingEnabled = false;

  @override
  double get volumeUnit => 0.2;

  void toggleNoiseCancelling() {
    noiseCancellingEnabled = !noiseCancellingEnabled;
  }

  @override
  void increaseVolume() {
    super.increaseVolume();
    _playVolumeSoundEffect();
  }

  @override
  void decreaseVolume() {
    super.decreaseVolume();
    _playVolumeSoundEffect();
  }

  _playVolumeSoundEffect() {
    print('🎵');
  }
}

void main() {
  NoiseCancellingHeadphone noiseCancellingHeadphone =
      NoiseCancellingHeadphone();
  noiseCancellingHeadphone.decreaseVolume(); // 🎵
  print(noiseCancellingHeadphone.volume); // 4.8
}